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c8ed99d4f6
linux/drivers/tty/serial
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Chen-Yu Tsai c8ed99d4f6 serial: 8250_dw: Add support for deferred probing 
The 8250_dw driver fails to probe if the specified clock isn't
registered at probe time. Even if a clock frequency is given,
the required clock might be gated because it wasn't properly
enabled.

This happened to me when the device is registered through DT,
and the clock was part of an MFD, the PRCM found on A31 and A23
SoCs. Unlike core clocks that are registered with OF_CLK_DECLARE,
which happen almost immediately after the kernel starts, the
clocks are registered as sub-devices of the PRCM MFD platform
device. Even though devices are registered in the order they are
found in the DT, the drivers are registered in a different,
arbitrary order. It is possible that the 8250_dw driver is
registered, and thus associated with the device and probed, before
the clock driver is registered and probed.

8250_dw then reports unable to get the clock, and fails. Without
a working console, the kernel panics.

This patch adds support for deferred probe handling for the clock
and reset controller. It also fixes the cleanup path if
serial8250_register_8250_port fails.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-07-27 11:07:08 -07:00
..
8250 serial: 8250_dw: Add support for deferred probing 2014-07-27 11:07:08 -07:00
cpm_uart serial: treewide: Remove empty implementations of enable_ms() 2014-07-09 17:29:38 -07:00
jsm serial: treewide: Remove empty implementations of enable_ms() 2014-07-09 17:29:38 -07:00
21285.c serial: treewide: Remove empty implementations of enable_ms() 2014-07-09 17:29:38 -07:00
68328serial.c Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gerg/m68knommu 2013-05-10 07:22:35 -07:00
altera_jtaguart.c serial: altera_jtaguart: Fix putchar function passed to uart_console_write() 2014-07-22 16:34:33 -07:00
altera_uart.c serial: altera: Adopt uart_console_write() 2014-07-11 17:49:46 -07:00
amba-pl010.c serial: amba-pl010: Use devres APIs 2014-07-09 17:13:54 -07:00
amba-pl011.c serial: amba-pl011: Remove redundant label 2014-07-09 17:13:54 -07:00
apbuart.c serial: treewide: Remove empty implementations of enable_ms() 2014-07-09 17:29:38 -07:00
apbuart.h
ar933x_uart.c serial: treewide: Remove empty implementations of enable_ms() 2014-07-09 17:29:38 -07:00
arc_uart.c Merge 3.16-rc5 into tty-next. 2014-07-13 15:52:12 -07:00
atmel_serial.c drivers/tty/serial: use correct type for dma_map/unmap 2014-07-22 16:34:33 -07:00
bcm63xx_uart.c serial: Fix IGNBRK handling 2014-06-19 13:04:52 -07:00
bfin_sport_uart.c serial: blackfin: Fix CTS flow control 2014-07-10 16:07:46 -07:00
bfin_sport_uart.h
bfin_uart.c serial: blackfin: Fix CTS flow control 2014-07-10 16:07:46 -07:00
clps711x.c serial: treewide: Remove empty implementations of enable_ms() 2014-07-09 17:29:38 -07:00
crisv10.c tty: Remove tty_hung_up_p() tests from tty drivers' open() 2014-07-10 16:06:49 -07:00
crisv10.h crisv10: use counts from tty_port 2013-03-18 16:26:33 -07:00
dz.c serial: treewide: Remove empty implementations of enable_ms() 2014-07-09 17:29:38 -07:00
dz.h
earlycon-arm-semihost.c tty/serial: add arm/arm64 semihosting earlycon 2014-04-24 16:32:27 -07:00
earlycon.c tty/serial: fix 8250 early console option passing to regular console 2014-06-19 13:07:26 -07:00
efm32-uart.c serial: efm32: correct namespacing of location property 2014-07-11 17:49:46 -07:00
fsl_lpuart.c tty: serial: fsl_lpuart: add 32-bit register interface support 2014-07-17 18:15:38 -07:00
icom.c serial: treewide: Remove empty implementations of enable_ms() 2014-07-09 17:29:38 -07:00
icom.h
ifx6x60.c serial: ifx6x60: Remove casting the return value which is a void pointer 2013-09-26 14:29:58 -07:00
ifx6x60.h serial:ifx6x60:Prevent data transfer when IFX6x60 port is shutdown 2012-11-01 08:50:01 -07:00
imx.c serial: imx: Fix build breakage 2014-07-11 17:43:13 -07:00
ioc3_serial.c serial: treewide: Remove empty implementations of enable_ms() 2014-07-09 17:29:38 -07:00
ioc4_serial.c serial: treewide: Remove empty implementations of enable_ms() 2014-07-09 17:29:38 -07:00
ip22zilog.c serial: Test for no tx data on tx restart 2014-07-10 16:31:34 -07:00
ip22zilog.h
Kconfig serial: lpc32xx uart module can't do console 2014-07-10 15:48:56 -07:00
kgdb_nmi.c tty: kgdb_nmi: Automatically manage tty enable 2014-07-17 18:19:40 -07:00
kgdboc.c treewide: Convert retrun typos to return 2013-09-04 12:26:36 +02:00
lantiq.c serial: Use UPF_* constants with struct uart_port flags 2014-07-10 16:06:49 -07:00
lpc32xx_hs.c serial: treewide: Remove empty implementations of enable_ms() 2014-07-09 17:29:38 -07:00
m32r_sio_reg.h
m32r_sio.c serial: Test for no tx data on tx restart 2014-07-10 16:31:34 -07:00
m32r_sio.h
Makefile tty/serial: Add GPIOLIB helpers for controlling modem lines 2014-05-28 12:49:14 -07:00
max310x.c serial: treewide: Remove empty implementations of enable_ms() 2014-07-09 17:29:38 -07:00
max3100.c serial: use dev_get_platdata() 2013-07-31 17:56:15 -07:00
mcf.c serial: Use UPF_* constants with struct uart_port flags 2014-07-10 16:06:49 -07:00
men_z135_uart.c tty: serial: men_z135_uart: Wakeup UART after transmitting 2014-07-09 17:35:42 -07:00
mfd.c serial: Fix IGNBRK handling 2014-06-19 13:04:52 -07:00
mpc52xx_uart.c serial: mpc512x: setup the PSC FIFO clock as well 2014-01-12 18:53:05 +01:00
mpsc.c serial: treewide: Remove empty implementations of enable_ms() 2014-07-09 17:29:38 -07:00
mrst_max3110.c serial: treewide: Remove empty implementations of enable_ms() 2014-07-09 17:29:38 -07:00
mrst_max3110.h
msm_serial_hs.c serial: use dev_get_platdata() 2013-07-31 17:56:15 -07:00
msm_serial.c tty: serial: msm: Make of_device_id array const 2014-07-23 18:56:18 -07:00
msm_serial.h tty: serial: msm: Support big-endian CPUs 2014-07-10 16:10:42 -07:00
msm_smd_tty.c TTY: msm_smd_tty, clean up activate/shutdown 2013-03-18 16:19:44 -07:00
mux.c serial: treewide: Remove empty implementations of enable_ms() 2014-07-09 17:29:38 -07:00
mxs-auart.c serial: treewide: Remove empty implementations of enable_ms() 2014-07-09 17:29:38 -07:00
netx-serial.c serial: Fix IGNBRK handling 2014-06-19 13:04:52 -07:00
nwpserial.c serial: treewide: Remove empty implementations of enable_ms() 2014-07-09 17:29:38 -07:00
of_serial.c printk/of_serial: fix serial console cessation part way through boot. 2014-05-28 13:07:27 -07:00
omap-serial.c tty: serial: omap: fix Sparse warnings 2014-04-24 16:19:02 -07:00
pch_uart.c serial: pch_uart: Update error message for dmaengine_prep_slave_sg() API 2014-07-11 17:49:46 -07:00
pmac_zilog.c serial: Test for no tx data on tx restart 2014-07-10 16:31:34 -07:00
pmac_zilog.h
pnx8xxx_uart.c serial: Fix IGNBRK handling 2014-06-19 13:04:52 -07:00
pxa.c serial: pxa: fix build with !SERIAL_PXA_CONSOLE 2014-07-10 15:48:41 -07:00
rp2.c tty: remove DEFINE_PCI_DEVICE_TABLE macro 2013-12-08 17:09:07 -08:00
sa1100.c serial: sa1100: delete .set_wake callback 2013-10-16 13:16:18 -07:00
samsung.c serial: samsung: improve code clarity by defining a variable 2014-07-17 18:18:22 -07:00
samsung.h serial: samsung: Neaten dbg uses 2014-05-28 12:27:22 -07:00
sb1250-duart.c serial: Fix IGNBRK handling 2014-06-19 13:04:52 -07:00
sc16is7xx.c serial: treewide: Remove empty implementations of enable_ms() 2014-07-09 17:29:38 -07:00
sccnxp.c serial: treewide: Remove empty implementations of enable_ms() 2014-07-09 17:29:38 -07:00
serial_core.c serial/core: Fix too big allocation for attribute member 2014-07-23 18:56:17 -07:00
serial_ks8695.c serial: Fix IGNBRK handling 2014-06-19 13:04:52 -07:00
serial_mctrl_gpio.c tty/serial: Add GPIOLIB helpers for controlling modem lines 2014-05-28 12:49:14 -07:00
serial_mctrl_gpio.h tty/serial: Add GPIOLIB helpers for controlling modem lines 2014-05-28 12:49:14 -07:00
serial_txx9.c serial: txx9: remove duplicate TXX9_SIFCR_TDIL_MASK define 2014-07-10 16:10:42 -07:00
serial-tegra.c serial: tegra: ack the rx dma desc after transfer terminated 2014-07-10 15:53:20 -07:00
sh-sci.c serial: sh-sci: Add calculation recive margin for HSCIF 2014-07-17 18:14:44 -07:00
sh-sci.h serial: sh-sci: Move overrun_bit and error_mask fields out of pdata 2013-12-24 11:17:48 +09:00
sirfsoc_uart.c serial: sirf: transfer more bytes once to decrease interrupts 2014-07-09 17:37:00 -07:00
sirfsoc_uart.h serial: sirf: transfer more bytes once to decrease interrupts 2014-07-09 17:37:00 -07:00
sn_console.c serial: treewide: Remove empty implementations of enable_ms() 2014-07-09 17:29:38 -07:00
st-asc.c serial: st-asc: Fix overflow in baudrate calculation 2014-07-27 11:05:08 -07:00
suncore.c
sunhv.c serial: treewide: Remove empty implementations of enable_ms() 2014-07-09 17:29:38 -07:00
sunsab.c Merge 3.16-rc5 into tty-next. 2014-07-13 15:52:12 -07:00
sunsab.h
sunsu.c serial: Fix IGNBRK handling 2014-06-19 13:04:52 -07:00
sunzilog.c serial: Test for no tx data on tx restart 2014-07-10 16:31:34 -07:00
sunzilog.h
tilegx.c serial: treewide: Remove empty implementations of enable_ms() 2014-07-09 17:29:38 -07:00
timbuart.c serial: treewide: Remove empty implementations of enable_ms() 2014-07-09 17:29:38 -07:00
timbuart.h
uartlite.c serial: treewide: Remove empty implementations of enable_ms() 2014-07-09 17:29:38 -07:00
ucc_uart.c serial: treewide: Remove empty implementations of enable_ms() 2014-07-09 17:29:38 -07:00
vr41xx_siu.c serial: Fix IGNBRK handling 2014-06-19 13:04:52 -07:00
vt8500_serial.c serial: vt8500: add missing braces 2013-10-16 13:22:16 -07:00
xilinx_uartps.c serial: treewide: Remove empty implementations of enable_ms() 2014-07-09 17:29:38 -07:00
zs.c serial: Fix IGNBRK handling 2014-06-19 13:04:52 -07:00
zs.h